Cisco ASR 5000 series Product Overview page 415

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Table of Contents

HRPD Serving Gateway Overview

PDN Connection Release by the UE Call Flow

PPP VSNCP-Term-Req

PPP VSNCP-Term-Ack

Table 60. PDN Connection Release by the UE Call Flow Description

The UE is attached to the EPC and has a PDN connection with the P-GW for PDN-ID=x and APN with assigned HNP.

The UE decides to disconnect from the PDN and sends a PPP VSNCP-Term-Req with PDNID=x.

The HSGW starts disconnecting the PDN connection and sends a PPP-VSNCP-Term-Ack to the UE (also with PDNID=x).

The HSGW begins the tear down of the PMIP session by sending a PBU Deregistration to the P-GW with the following

attributes: Lifetime=0, MNID, APN, ATT=HRPD, HNP. The PBU Deregistration message should contain all the mobility

options that were present in the initial PBU that created the binding.

The P-GW looks up the Binding Cache Entry (BCE) based on the HNP, deletes the binding, and responds to the HSGW

with a Deregistration PBA with the same attributes (Lifetime=0, MNID, APN, ATT=HRPD, HNP).

The HSGW optionally sends a Router Advertisement (RA) with assigned HNP and prefix lifetime=0.

Call/Session Procedure Flows ▀

Cisco ASR 5000 Series Product Overview ▄